Ŏt/a-cous'tic1, a.
a. [Fr. otacoustique, from Gr. οὖς, ὠτός, an ear, and ἀκουστικός, belonging to the sense of hearing. See ACOUSTIC.] Assisting the sense of hearing; as, an otacoustic instrument.
2 entries under this word
Otacoustic
Ōt/a-cous'tic or Ōt/a-cous'ti-cŏn2, n.
n. An instrument to facilitate hearing, as an ear-trumpet.